Fire Safety Science Digital Archive

A fire wall and a fire resistant covering material are made of a mixture of cement mortar and aqua-reserve agents such as a silica gel or a humid pearlite. However, such a fire wall does not show a good fire resistant characteristics since the aqua-reserve agent such as the silica gel contains a small amount of water in it. A super absorbent polymer gel which absorbs aqueous solution of calcium chloride, absorbs or evaporates water vapor until it reaches to the equilibrium state when a humidity of a room changes. Therefore, the gel could be used as the aqua-reserve agent for the fire wall since it contains much water comparing with the silica gel. In this study, the effective diffusivity of the super absorbent polymer gel and the pearlite-mortar in which the gels are mixed, were obtained by experiments. And also the numerical simulation for the moisture diffusion in the formed gel and the pearlite-mortar in which the gels were mixed, were conducted using the obtained effective moisture diffusivity.